A Complete Range of Universal Input Digital Panel Indicators for Temperature and Process Measurement

Universal Input
Any one of over 20 different input types can be directly connected. Thermocouple, RTD, 20mA, mV and 10 volt signals are accepted as standard.

Universal Power Input
Wide-ranging 90 to 265vAC input allows world wide installation. Low voltage AC/DC input option available.

Tough but Attractive
Designed to enhance the looks of any instrument panel, the enclosure uses flame retardant (VO) materials and the front panel conforms to IP65 (NEMA 4). The plug in sleeve type construction facilitates simple exchange for routine servicing/calibration.

Connectivity
Digital Status inputs, serial communications, analogue output, transmitter supply, alarm relays, transducer supply, are all available. The instrument can be removed for routine servicing without disturbing these connections.

Clear Display
The flat, slightly recessed display, together with high brightness red or green LEDs ensure maximum visibility even in difficult ambient lighting conditions.

Front Panel Control
Full set-up is available using the front panel buttons to step through a simple password protected menu. Some functions can be made directly available to an operator. Alternatively, units can be supplied without buttons.

User-Definable Buttons
Two of the front panel buttons can be user programmed to provide one or more special functions such as tare and auto zero.  

Applications

Temperature
The Tracker 220 series can be used in a wide variety of temperature measurement applications with results displayed in °C, °F or Kelvin (Absolute). In applications where non-linearising temperature transmitters are used, the Tracker 220 series can linearise the 4-20 mA signal received to the thermocouple curve. Where accuracy is vital to an application, a 220 series indicator can be calibration-matched to the output of the actual sensor to be used, thus removing most system measurement errors.

Signal Re-Transmission
The user-programmable isolated analogue output allows the 220 series to be used in applications where a local display as well as data recording is required. This output can be configured to transmit the measured, averaged, maximum or minimum value and has its own damping filter for noisy or fast moving signals. The input can be locally conditioned and re-transmitted over a relatively long distance. Being electrically isolated, problems associated with earth loops, which are often encountered in measurement systems, are eliminated.

Pressure and Weighing
A variety of pressure transducers, pressure transmitters or strain gauge bridges can be connected to the Tracker 220 series. The indicator and sensor can be matched using the user calibration feature, greatly reducing errors due to sensor output and excitation supply voltage variations. A front panel button, or digital status input, can be configured to provide an auto zero feature allowing zero offset errors to be eliminated. For weighing applications, a tare function can be similarly configured.

Communications
The Tracker 220 series serial protocol is compatible with most SCADA software packages. Up to 32 indicators can be connected to a single master device in a multi-drop two or four wire configuration. Tracker PC-based software can be supplied which enables multiple configurations to be modified and stored. The display and analogue output can be controlled via the serial interface, allowing an indicator to be used as a remote display or control device.

Process Inputs
The Tracker 220 series indicators have a number of features which make them particularly suitable for the measurement of process signals. Maths functions allow calculations for orifice plate, "V" notch weir flow and rectangular (Cippaletti) weir flow. A filter is available for noisy or fast-moving signals. A 24 point user linearisation facility is provided for applications such as tank contents measurements. All of the Tracker 220 input types can be scaled to any engineering units within the display range or, if necessary, mapped to one of the thermosensor or user linearisation curves. SG Correction is also available.

Alarm and Control
The comprehensive alarm functions built into the Tracker 220 series make them particularly suitable for monitoring, switching and control applications. The hysteresis facility stops noisy signals switching alarms. High and low deviation allow control around a setpoint. On and off delay times can be set, with individual alarms configured as latching or non-range or, if necessary, mapped to one of the thermosensor or user linearisation curves. SG Correction is also available. latching, depending upon user requirements. Alarms can be displayed or acknowledged on the Tracker 220 front panel.
 
 
 

Features

Universal Input
All of the Tracker 220 series can be directly connected to most process sensors including thermocouples, RTDs, 20mA loops, transmitters, or DC type signals. All thermosensor ranges have built-in linearisation curves and internal or external CJC is available. The display can show °C, °F or Kelvin (Absolute), with the decimal point position being user-adjustable to give the required measurement resolution or switched to automatic (auto-ranging mode). The sensor break detection can be selected to produce upscale or downscale readings. Process inputs can be scaled to any engineering unit and any input can be mapped to one of the thermosensor linearisation curves.

Analogue Output
Models 223 and 224 are fitted with an electrically isolated analogue output which has 0.05% resolution. 20mA loops, transmitters, or DC type signals. All This can be configured by the user as 0-10 volt, 0-20 mA or 4-20 mA and can be scaled over any portion of the display range. For example, a type K thermocouple can be retransmitted as a linear 4-20 mA signal equivalent to 0-1000°C to another device such as a chart recorder or data logger. The output is linear to temperature (display value).
The analogue output can be set to transmit the measured, the maximum, the minimum or the averaged value and has its own damping filter for noisy or fast moving signals.

Sensor Excitation
All Tracker 220 models are fitted with a fixed 24 volt DC output which is electrically isolated. This can be used to power a single 20 mA loop for two wire transmitters. In addition the Tracker models 221 and 222 have a 10v regulated supply and the Tracker models 223 and 224 are fitted with a programmable 0-12 volt DC regulated output. Both of these outputs are electrically isolated to 500v. The programmable supply is configured via the internal software and is primarily designed to power strain gauge-type sensors including load cells.

User Linearisation
Some applications require a special linearisation curve to be defined by the user. A typical example is tank contents measurement where the pressure of a liquid can be measured, but this does not have a linear relationship to the actual volume. User linearisation allows up to 24 calibration points to be defined. Each point can be entered manually or, for greater accuracy, directly from the sensor output, thus removing most system measurement errors. The 24 readings can be entered in any order. The Tracker 220 will use the stored values to define the required linearisation curve.

Analogue Output
Models 223 and 224 are fitted with an electrically isolated analogue output which has 0.05% resolution. This can be configured by the user as 0-10 volt, 0-20 mA or 4-20 mA and can be scaled over any portion of the display range. For example, a type K thermocouple can be retransmitted as a linear 4-20 mA signal equivalent to 0-1000°C to another device such as a chart recorder or data logger. The output is linear to temperature (display value).
The analogue output can be set to transmit the measured, the maximum, the minimum or the averaged value and has its own damping filter for noisy or fast moving signals.

Serial Communications
Both models 223 and 224 are fitted with an electrically-isolated RS 422/485 serial interface. Models 221 and 222 can optionally be fitted with two wire communications. All measured values and set-up parameters are accessible, however, the instruments can be set to be read only, thus protecting their configuration.
Two protocols are available, namely the MODBUS and the proprietary DTPI, which has been designed to be easier to implement. The display, analogue output and transducer supply can all be set or configured via the serial interface.

Alarms
Each of the Tracker 220 series has four software alarms. These can be configured by the user for alarm type, setpoint, on/off delay and on/off hysteresis value. Alarms can be individually set to be latching or non-latching and to flash a message on the front panel display when active. Any of the four software alarms can operate a relay (models 222 and 224 only). In addition a special AND function allows a relay to switch only if two or more alarm conditions are active. Relays can be configured to be energised or de-energised in the alarm condition.
 

Download Tracker 220 Data Sheet